This time, we’re diving into the suspension and aero mods.
It looks like the TG-RR is running Cusco upper (1) and lower front (2) control arms. However, the upper arms appear to be modified. Instead of the usual threaded inserts for camber adjustment, they’ve CNC-ed a new upright-side end (3) that accepts shims.
This could be because threaded inserts simply aren’t strong enough to handle the stress of 260 mm slick tires. Or, maybe shims are just easier to adjust and keep consistency side-to-side and more reliable not to change during the load of 24h racing.
Another thing that catches the eye is the heavy bracing on the rear subframe (4). Again, this is likely related to the use of slick tires, as well as the notoriously harsh curbs at the Nürburgring.
Even though they went with a coilover setup in the back, they didn’t bother replacing the spring arms, apart from what looks like polyurethane bushings (5) on the inner side.
The rear coilovers appear to be Bilstein AS2s, featuring single adjustment on the shaft. Unfortunately, the part number …3277/E4-MBE-XX95A2… doesn’t reveal much, as it seems to be just for the extension collar at the base of the shock.
TG-RR is running wheel spacers front and back (6), which looks like it reduces the offset by at least 10mm, maybe more. Their spec sheet says they’re running 18×9.5J ET +40 (7) wheels all around. I’m guessing that’s the raw wheel offset, without factoring in the spacers. So, the effective offset they’re actually running is probably closer to +30.
A few more interesting details at the rear: internally routed brake lines (8) for better protection and dry disconnect fittings for the braided lines (9). There’s also a vehicle height/suspension travel sensor (10), most likely used for aero adjustments.
Unfortunately, I couldn’t track down any detailed photos of the front suspension. From the single shot I do have, I can’t really spot anything too interesting or useful.
Moving on to the aero, the TG-RR GR Yaris is running a custom front splitter, small canards on the sides of the front bumper, a Rally2 style rear wing with small extensions added to the sides and custom vented front fenders. Nothing crazy.
Interestingly enough, they aren’t using the OEM fuel tank covers available on the later model GR Yaris. Instead, they just have some CF plates attached to the bottom of the fuel tank. These seem to do more for impact protection than actual aerodynamics.
